Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de9a1cbc5c30985…

MALICIOUS

PDF

96.9 KB Created: 2021-08-06 14:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5659216a7e80c535ebd9fd47d9a2a151 SHA-1: bfdfc4897dd18462ef6668aff81470505782b0ff SHA-256: 7de9a1cbc5c309859cb33f0e152e26ac6cad4027d1db20d667589e57aaebc8cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. The document body is heavily obfuscated and contains no readable text, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://askort.pl/Upload/file/nufawigigekax.pdf In PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8766dfd5---nirarali.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bda59bd1e6---26711978134.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4c91a4ea7---31856069029.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/dalisitatidixix.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607533c623576---zopodigapu.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/kijiwidefaxidoxurugaxu.pdfIn PDF document text
    • https://tsegypt.com/file/joxakepesuwupexidufarepe.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tutijaf.pdfIn PDF document text
    • https://temahr.hr/files/sigulifuridawi.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/6205898473.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/gikesusutadoraza.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/suxarux.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c388fec7002---tejadomobasiwupevoxeva.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c8053beae---zifukilebivaluxejawi.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/bujot.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/7sa24dh83a4t1r2g88o5jvr9tr/12880268091.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a921bfe5b---9294014207.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b2fe33043977bda3796bb5fc82b0c404/61987287675.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae270509c---robavinewimam.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/53670657507.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/32851806178.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/60052479366.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/338221e77c894386d787047ca1547d79/sikolowugipezisimu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102b515b3157---62437142729.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/76755530098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ender+3+v2+datasheetPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 18768 bytes
SHA-256: 88a0c5f165191ee5d83d5f0dadd683ecfaf214ea34ab169a030364d24e68b731
font_01_sfnt_off000144e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E5 10428 bytes
SHA-256: b4f8ac10a935ab7b778d0f2499061b3561b48f40a4ac788562e5b6a0e7e99708
font_02_sfnt_off00015c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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